This is actually more common than you'd think, as far as I know. Beginners especially experience this, or in your case, a non-beginner who has recently begun again. They tend to go away the longer you stick with it, but I myself am only lately getting back in the dream journal/reality check/etc. routine, and I could be mistaken. I'd say just stick with your reality checks, perform them regularly in your dream to keep yourself grounded, and maybe have a written list of dream goals that you wish to achieve in lucid dreams that you review before bed each night. It'll give you something to try in the dream, and that may further ground your lucidity. Hope that helps, and I hope some other DV member doesn't point out that none of that is right at all!

Keep with it and good luck, though.